It depends on if you consider giving money to your church and religious organizations charity. That also helps inflate "volunteering" numbers among conservatives vs liberals. The Catholic Church and the LDS Church tend to be active in helping the poor, but most protestant churches and organizations tend to emphasize the individual and preach prosperity gospel and the like. More likely to judge the poor than to go out of their way to help them. Not all, of course, but more likely than the Catholics or the Mormons (or liberal atheists/heathens of all types).